Ok here is where someone else may have to chime in. I do not think that pump will adequately work to all those diffusers at that same time even with a gang valve to help control air flow.... I may be wrong I'm just not sure?? Hopefully someone like Esshup or Bill will chime in and let your know for sure?

RC

The only difference between a rut and a Grave is the depth. So get up get out of that rut and get moving!! Time to work!!